html轉canvas html2canvas.js

$("#btn-html2canvas").on("click",function(){//btn-html2canvas爲按鈕
//content-main爲要轉換的元素的id
            html2canvas(document.getElementById('content-main'), {
                onrendered: function(canvas) {
                    document.body.appendChild(canvas);
                },
                 width: 300,
                 height: 300
            });
        })